JPH01128877A - information recording medium - Google Patents

Abstract

PURPOSE: To provide an information recording medium which is exquisitely forgery-proof by forming an infrared reflecting layer on a substrate and recording information on the infrared reflecting layer in a combination of a carbon black ink and assortment inks such as cyan, yellow and magenta. CONSTITUTION: When a recorded part 2 formed on a card is read by the infrared beam a recording medium 3 absorbs an infrared beam, and a recording medium 4 permits transmission of the infrared beam through itself to reflect the infrared beam using its lower layer as an infrared beam reflecting layer 7. Thus it is possible to read a signal which coincides with only an appropriate pattern to real information from the recording medium 3, and make available the intrinsic information to the card, of the recording medium 3. In addition, the recording medium 3 and a simulated recording medium 4 turn black in a visible area respectively, so that it is impossible to visually determine their respective identity. For this reason, there is no alternative but to form a recorded pattern using one kind of recording material when a forger attempts to tamper with the card. If this tampering technique is used, a reader side easily discerns a forgery and therefore, forgery of the card can be prevented from being committed.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a card on which information is recorded in a manner that cannot be visually discerned, and the information recording medium herein refers to card-like articles, train tickets, coupon tickets, and commuter passes. , gift certificates, voting tickets, and other items that require counterfeit prevention.

[Prior art and problems to be solved by the invention] In recent years, 1
．． D, card, credit card, cash card,
With the spread of gift cards, prepaid cards such as telephone cards, train tickets, coupon tickets, commuter passes, gift certificates, voting tickets, etc., interest in anti-counterfeiting technology is increasing.

In view of conventional techniques for preventing counterfeiting of cards, the first method is to form an information-forming body, such as a hologram, which is difficult to obtain, on a base as a verification recording section. However, providing a hologram-like formation on a card increases the manufacturing cost of the card itself, so although it is used for some membership cards, it is used for prepaid cards, train tickets, etc. that do not identify the user. This is difficult to implement for coupon tickets. A method of forming a verification record section on such disposable cards is to form a barcode,
There is a method of optical reading, but since the recorded portion is visible, it is highly susceptible to forgery and lacks reliability.

In addition, it is also possible to form a verification recording part that can be read only by invisible light, but it is possible to use quinocyanines, which are the materials of invisible light recording bodies that are usually considered,
Thiacyanins are generally expensive and lack versatility. Also, by obtaining recording materials, it is also possible to make a similar card (Th3fi).

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention proposes an information recording medium that uses cheaper and more versatile recording materials and is difficult to counterfeit. An information recording medium in which an infrared reflective layer is formed on a substrate, and information is recorded on the infrared reflective layer by a combination of carbon black ink and mixed color ink of cyan, yellow, and magenta. This is what we provide.

[Function] According to the present invention, the verification recording portion formed on the substrate is made of two types of ink having different infrared light absorption characteristics, and in the visible area, the light absorption characteristics are the same, and the ink is In the outer area, it is a distinguishable verification recording section.

This makes it possible to provide an information recording medium with higher anti-counterfeiting properties, and the recording material A'31 used is inexpensive and versatile.

Embodiments Next, embodiments of cards, which are examples of information recording media based on the present invention, will be described in detail with reference to the drawings.

Figure 1 shows a recording section (2) formed on a card base material (1).
FIG. There is no particular limitation on the position where the recording section (2) is formed, and it may be formed on either the front or back side of the card. Also,
A printing layer, a protective layer, or a concealing layer may be formed on the formed recording part (2) so as not to spoil the appearance of the card.

FIG. 2 is a cross-sectional view of the card shown in FIG. 1 along line I-I"IIτ". FIGS. The recording portion (2>) on the base material (1) is composed of two types of ink that have the same hue in the visible light region but different spectral absorption rates in the infrared light region.

One consists of a recording body (3) made of ink with high infrared absorption properties, and the other consists of a recording body (4) made of ink with low infrared absorption properties.
). The recording body (3) is formed as a pattern corresponding to true information, and the other recording body (4) is formed as a pseudo pattern of one of the recording bodies (4).

Further, an infrared light reflective layer (7) is formed between the card base material (1) and the recording section (2). +J of the layer that reflects infrared light
Ordinary white ink may be used as rEl. Further, the card base material (1) itself may also serve as a layer that reflects infrared light. The card base material (1) is made of plastics such as polycarbonate resin, polyvinyl chloride resin, or polyester resin, or paper, and if it also serves as a layer that reflects infrared light, it may be white. desirable.

Furthermore, transparent or opaque protective layers (8) are formed on both sides of the card base material (1). The ink recording medium (3) with a high one-stage characteristic of infrared light uses commonly used carbon black ink.

In addition, recording materials with low absorption characteristics of infrared light (4> are the commonly used processes for cyan (23>, yellow (21>), magenta (22>) showing the light transmittance shown in Figure 3). It is a mixed color ink made by mixing inks.Each ink (2 pieces), (22), (23) has an infrared range of 700
In the wavelength range of nm or more, the transmittance of infrared light is high.

Furthermore, the transmittance of light decreases in the visible region, and when three colors are mixed, a blackish color appears when visually observed.

When the recording part (2) formed on the card in this way is read with infrared light, the recording body (3) absorbs the infrared light, and the recording body (4>) transmits the infrared light. Since the infrared light reflective layer (7) below reflects infrared light, the recording medium (3)
It becomes possible to read signals that match only the pattern corresponding to the true information of the recording medium (3), and information unique to the card of the recording medium (3) can be provided. Moreover, the recording body (3)
and the false recording medium (4) are black in the visible range, so it is impossible to visually distinguish between them. For this reason, person 1 who attempts to tamper with the cart has two kinds of recording medium (3) whose recording section (2) is responsible for the infrared light absorption property.
(4) A similar recording pattern is created by a kind of record scanning, and even if this is used, the reader can easily identify falsification, so it is difficult to forge a card. It can be prevented.

Furthermore, since the recording material used in the present invention is a commonly used process ink, it is inexpensive and highly versatile. In addition, the card base material (1) and the infrared light reflective layer (7)
A magnetic layer may be formed on a part or the entire surface of the card between the two. In this case, a metal vapor deposited layer such as aluminum may be used as the infrared light repelling layer.

FIGS. 4 to 6 are diagrams showing other embodiments of cards based on the present invention. Figure 4 shows a recording material (4) with low infrared light absorption characteristics filled in between the true information patterns of a recording material (3) with high infrared light absorption characteristics, which can be visually observed. It is recognized as a simple black stripe. Since the user can easily think of it as simply a pattern, design, etc. on a stripe, the possibility of tampering can be increased. Furthermore, a true information pattern may be formed using a recording medium (4) having low infrared light absorption characteristics, and the space between them may be filled with a recording medium (3) having high infrared light absorption characteristics.

Figure 5 shows that a recording medium (4) with low infrared absorption characteristics is formed in a stripe shape on an infrared light reflection layer (7), and a recording medium (3) with high infrared absorption characteristics is placed on top of the infrared reflection layer (7). This is an example in which an information pattern is formed and a protective layer (8) is formed on top of the information pattern. In this case, as in the embodiment shown in FIG. 4, it is recognized visually as a simple black stripe, and in manufacturing, it is easy to register the recording medium (3) and the recording medium (4). can be formed into

FIG. 6 is necessary in an embodiment in which the true information pattern of a recording medium (3) having a high infrared absorption characteristic is hidden by a recording medium (4) having a low infrared absorption characteristic. In this case, hues other than black (for example, deep green, ), it is possible to create a more beautiful appearance.

Although the above embodiment has been described only for cards, it can be used for various information recording media that require prevention of forgery, such as commuter passes, gift certificates, voting tickets, train tickets, etc.

[Effects] According to the present invention, it is possible to provide an information recording medium having high anti-counterfeiting properties, and the material used for the recording body is extremely inexpensive and highly versatile.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a black recording medium formed on a card, and FIGS. 2, 4 to 6 are cross-sectional views taken along the line I-I'' in FIG. 1, showing examples of the present invention. 3 is a diagram showing the light transmittance characteristics of cyan, yellow, and magenta process inks of the present invention. 1... Card base material 3... Recording body 4 made of carbon black ink.・・・
2nd chart of recording material using mixed color ink

Claims (1)

[Claims] (1) An information recording medium in which an infrared reflective layer is formed on a substrate, and information is recorded on the infrared reflective layer using a combination of carbon black ink and mixed color ink of cyan, yellow, and magenta.